I have contributed to the archive before. (Your welcome for Tengu Man's stage for playstation...) Now I have the japanese intros for mega man 8, x4, and x5. I have zipped them and uploaded them to ultrashare.net. So maybe the webmaster or someone else who runs the site can download and upload. I have tagged them similarly to the others in the archive. Not the highes quality... but what do you expect from a cutscene in a ps1 game?
http://ultrashare.net/hosting/fl/0256ce2c74/
